By the time he arrived at Cook's in an ambulance, the teen was rapidly declining.

"They did the X-ray Sunday morning and it was completely cloudy all the way through the lungs. And they had cranked his oxygen up to 100, which is as high as it can go. And short of intubating him, they had the highest type of ventilator they could use and he still wasn't getting enough oxygen," said Tryston's dad Matt Zohfeld.

Within 48 hours of arriving, Tryston couldn't breathe on his own.

Doctors tested him for every infection and virus they thought he'd contracted, but it wasn't until his cousin arrived with Tryston's vaping paraphernalia that they found the cause.